#[cfg(feature = "clipboard")]
pub mod clipboard {
    use crate::commands::WholeStreamCommand;
    use crate::context::CommandRegistry;
    use crate::prelude::*;
    use futures::stream::StreamExt;
    use nu_errors::ShellError;
    use nu_protocol::{ReturnValue, Signature, Value};

    use clipboard::{ClipboardContext, ClipboardProvider};

    pub struct Clip;

    impl WholeStreamCommand for Clip {
        fn name(&self) -> &str {
            "clip"
        }

        fn signature(&self) -> Signature {
            Signature::build("clip")
        }

        fn usage(&self) -> &str {
            "Copy the contents of the pipeline to the copy/paste buffer"
        }

        fn run(
            &self,
            args: CommandArgs,
            registry: &CommandRegistry,
        ) -> Result<OutputStream, ShellError> {
            clip(args, registry)
        }

        fn examples(&self) -> &[Example] {
            &[Example {
                description: "Save text to the clipboard",
                example: "echo 'secret value' | clip",
            }]
        }
    }

    pub fn clip(
        args: CommandArgs,
        _registry: &CommandRegistry,
    ) -> Result<OutputStream, ShellError> {
        let stream = async_stream! {
            let mut input = args.input;
            let name = args.call_info.name_tag.clone();
            let values: Vec<Value> = input.collect().await;

            let mut clip_stream = inner_clip(values, name).await;
            while let Some(value) = clip_stream.next().await {
                yield value;
            }
        };

        let stream: BoxStream<'static, ReturnValue> = stream.boxed();

        Ok(OutputStream::from(stream))
    }

    async fn inner_clip(input: Vec<Value>, name: Tag) -> OutputStream {
        if let Ok(clip_context) = ClipboardProvider::new() {
            let mut clip_context: ClipboardContext = clip_context;
            let mut new_copy_data = String::new();

            if !input.is_empty() {
                let mut first = true;
                for i in input.iter() {
                    if !first {
                        new_copy_data.push_str("\n");
                    } else {
                        first = false;
                    }

                    let string: String = match i.as_string() {
                        Ok(string) => string.to_string(),
                        Err(_) => {
                            return OutputStream::one(Err(ShellError::labeled_error(
                                "Given non-string data",
                                "expected strings from pipeline",
                                name,
                            )))
                        }
                    };

                    new_copy_data.push_str(&string);
                }
            }

            match clip_context.set_contents(new_copy_data) {
                Ok(_) => {}
                Err(_) => {
                    return OutputStream::one(Err(ShellError::labeled_error(
                        "Could not set contents of clipboard",
                        "could not set contents of clipboard",
                        name,
                    )));
                }
            }

            OutputStream::empty()
        } else {
            OutputStream::one(Err(ShellError::labeled_error(
                "Could not open clipboard",
                "could not open clipboard",
                name,
            )))
        }
    }
}